/**
 *    Copyright (C) 2008, 2009  Victor Smirnov <aist11@gmail.com>
 *
 *    This program is free software; you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation; either version 3 of the License, or
 *    (at your option) any later version.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License along
 *    with this program; if not, write to the Free Software Foundation, Inc.,
 *    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 *    See LICENSE.exceptions in the root folder of this project for possible
 *    exceptions
 *
 */

#ifndef _CUBEFS_CORE_TOOLS_TYPES_RELATION_SORT_HPP
#define	_CUBEFS_CORE_TOOLS_TYPES_RELATION_SORT_HPP

#include <cubefs/api/types.hpp>

#include <cubefs/core/tools/types/relation/expression.hpp>
#include <cubefs/core/tools/types/relation/metadata.hpp>
#include <cubefs/core/tools/types/typelist.hpp>
#include <cubefs/core/tools/assert.hpp>


namespace cubefs    {
namespace tools     {

using namespace cubefs;

template <
        typename Metadata,
        Int ColumnName,
        bool Asc,
        typename Relation
>
class Sorter {
    CUBEFS_STATIC_ASSERT(IsRelationMetadata<Metadata>::Value);
    CUBEFS_STATIC_ASSERT(IsList<Relation>::Value);

    typedef typename FindColumn<ColumnName, typename Metadata::List>::Result    Column;
    typedef typename Column::Type                                               ValueType;

    template <typename Record>
    struct ValueProvider {
        typedef typename Metadata::template Provider<ColumnName, Record>::Value ColumnValue;
        static const ValueType Value = ColumnValue::Value;
    };

public:

    typedef typename Sort<Relation, ValueProvider, Asc, ValueType>::List        Result;
};


}
}

#endif //_CUBEFS_CORE_TOOLS_TYPES_RELATION_SORT_HPP